Home / Milling / Mill Tooling / Boring Head, R-8 3″ Square, 1″ Boring Bars Armstrong Boring Head, R-8 3″ Square, 1″ Boring Bars Armstrong$149.00 Category: Mill Tooling Description Description Armstrong 3″ Boring Head w/ R8 Shank, 1″ Boring Bars w/ 1/2″ Reducer Related products Arbor, Boring Head, 30 NMTB 1-1/2″ 18TPI $30.00 Read more Collet Chuck, 50 NMTB w Collets Bofors Sweden $149.00 Read more Arbor, Stub, Straight Shank 1″, 1-5/8″ $49.00 Read more Arbor, Horizontal Milling, Straight Shank 1-1/4″, 1″ x 1/4″ Key $75.00 Read more